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Concrete Footing Volume Calculator

Work out concrete footing volume instantly with clear inputs, formula shown and shareable results.

About Concrete Footing Volume Calculator

Pad footing concrete is the plan area times the thickness for each footing. Excavation is always larger: 150 mm of working space on each side lets the shuttering be placed and stripped, and 50 mm of blinding gives a clean base to fix reinforcement on.

Formulas

Footing volume

V = length x width x thickness x count

Excavation

V exc = (L + 0.3) x (W + 0.3) x (T + 0.05) x count

Worked example

With the default values below, Concrete Footing Volume Calculator returns Total concrete volume of 6.075. Change any input above and every figure here is recalculated in your browser.

Inputs used

Footing lengthminimum 0.1 m
1.5 m
Footing widthminimum 0.1 m
1.5 m
Footing thicknessminimum 0.05 m
0.45 m
Number of footingsminimum 1
6

Results

Total concrete volume
6.075 m³
Volume per footing
1.0125 m³
Excavation including working space
9.72 m³
Blinding area
19.44 m²

Step by step

  1. 1Values used
  2. 2Footing volume
  3. 3Excavation
  4. 4Total concrete volume= 6.075 m³
  5. 5Volume per footing= 1.0125 m³
  6. 6Excavation including working space= 9.72 m³
  7. 7Blinding area= 19.44 m²

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Concrete Footing Volume figure worked out?

V = length x width x thickness x count. Pad footing concrete is the plan area times the thickness for each footing.

Why blind the bottom of the excavation?

Blinding stops soil contaminating the concrete cover and gives a level surface to set bar spacers on, which is what actually delivers the specified cover to the steel.

What values do I need to enter?

This calculator takes 4 inputs: Footing length, Footing width, Footing thickness, Number of footings. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.

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